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target/imagebuilder: use multi-thread support for xz compression

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This speeds up the packing of the imagebuilder a lot:

 imagebuilder-T0.tar.xz real 0m25.199s user 2m45.967s sys 0m1.218s
 imagebuilder-T1.tar.xz real 2m02.543s user 2m02.418s sys 0m1.653s
 imagebuilder-T2.tar.xz real 1m03.684s user 1m59.931s sys 0m0.587s
 imagebuilder-T3.tar.xz real 0m48.033s user 2m02.904s sys 0m0.637s
 imagebuilder-T4.tar.xz real 0m38.963s user 2m15.521s sys 0m0.783s
 imagebuilder-T5.tar.xz real 0m37.994s user 2m21.461s sys 0m0.919s
 imagebuilder-T6.tar.xz real 0m39.524s user 2m48.115s sys 0m1.279s
 imagebuilder-T7.tar.xz real 0m34.061s user 2m45.097s sys 0m1.174s
 imagebuilder-T8.tar.xz real 0m27.286s user 2m55.449s sys 0m1.329s
 imagebuilder-T9.tar.xz real 0m25.205s user 2m44.894s sys 0m1.208s

To keep the output reproducible in any case, we enforce a minimum amount
of 2 threads.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
[refactored into reusable NPROC var, more verbose commit message]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
Martin Schiller
2019-10-07 06:52:08 +02:00
committed by Petr Štetiar
parent a92f74ba8d
commit b204fcdb07
2 changed files with 2 additions and 1 deletions
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1
rules.mk
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@@ -70,6 +70,7 @@ TARGET_SUFFIX=$(call qstrip,$(CONFIG_TARGET_SUFFIX))
BUILD_SUFFIX:=$(call qstrip,$(CONFIG_BUILD_SUFFIX))
SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
BUILD_SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
NPROC:=$(shell sysctl -n hw.ncpu 2>/dev/null || nproc)
export SHELL:=/usr/bin/env bash
IS_PACKAGE_BUILD := $(if $(filter package/%,$(BUILD_SUBDIR)),1)